Hook for a gut string polishing machine



June 21, 1932. MATTHEWS 1,863,864

HOOK FOR A GUT STRING POLISHING MACHINE Filed NOV. 5, 1928 .70 P 6 V 7 I a; A +2 f'gm 4 4 fa 4 a r q:

V- H7 I iii 5-13 Qifivflfif up 776.55. 75 5 Ga Z. Mai 27761115 ww p/zz w a Faten'ted June 21, 1932 UNITED STATES GUY L. MATTHEWS, OF CHICAGO, ILLINOIS, ASSIGNOR TO HARRY LJDIEHL, OF CHICAGO, I

PATENT OFFICE,

ILLINOIS HOOK FOR A GUT STRING POLISHING MACHINE Application filed November This invention pertains to the general class of devices used in polishing machines, and particularly to a hook used in a machine for polishing gut strings. An object of applicants invention is the production of a hook for the purposes set forth, whereby the strings may be rotated about its longitudinal axis. A further object of applicants invention is the production of a device as set forth, whereby the string may be readily attached and detached. A further object is the production of a hook of the kind set forth whereby the vibration of the string during rotation of same is reduced to a minimum. A further object is the production of a hook as set forth that is of low cost, readily manufactured, economical to produce, easily installed and hi hly satisfactory for its intended purpose.

Many other objects and advantages of the construction herein shown and described will be obvious to those skilled in the art from the disclosure herein given. To this end my invention consists in the novel construction, arrangement and combination of parts herein shown and described, and more particularly pointed out in the claims. Applicants hook is adapted to be used in a polishing apparatus such as is disclosed in applicants copending application Serial No. 139,544, filed October 4, 1926. When the string is rotated about its longitudinal axis, unbalanced forces, vibration, slapping of the strings, and any tendency to polish one side of the string more than the other, as Well as other difficulties are greatly diminished. The hook described in this application is particularly adapted to be used in a machine wherein a plurality of strings are polished at the same time, same being arranged side by side in the machine. By having the string more or less balanced about its longitudinal axis, interference between the strings is avoided.

In the drawing, wherein like reference characters indicate like or corresponding parts:

Fig. 1 is a fragmentary plan view of a machine having applicants invention incorporated therein.

Fig. 2 is a section taken on line 22 of Fig. 1;

5, 1928. Serial no. 317,461.

Fig. 3 is a fragmentary plan view of one end of the novel hook showing a loopin dotted lines attached thereto;

Fig. 4 is a fragmentary elevation of one end of the hook showing the string in dotted lines secured to the hook by means of the knot between the string and the loop;

Fig. 5 is an end view ofthe hook; and

Fig. 6 is a view taken on line 6-6 of Fig; 4.

Referring to the drawing, 1 shows a polishing apparatus comprising a frame 2' upon which is mounted transversely extending supports 3. In the members 3 are preferably mounted wooden blocks 4 which support a drive shaft 5 and a plurality of shorter shafts 60. The shaft 5 is belted or otherwise connected as shown at to a motor or other driving means, not shown.

As clearly shown in Fig. 2, the shaft 5' extends the full width of the machine and has a hook 7 projecting from one end thereof. A gut string 8 is shown attached to hook 7 by means of a loop 9. The loop 9 is attachedto the string 8 preferably by means of a knot. At 10 are shown a plurality of bearings for the shaft 5. The bearings are preferably mounted in recesses in blocks 4 which may be wood, babbitt or other suitable material in order to decrease vibration and noise. The shaft 5 has a gear 11 secured thereto'which meshes with a gear 12 attached to the adjacent shaft 6. Each of the parallel shafts 6 have a gear 12 secured thereto, said gears arranged to forma train such that each of the shafts6 are rotated with the shaft 5.

In Fig. 1 it is clearly seen that the hooks 13 on the shafts 6 project from one side of the frame similar to the hook 7 on'shaft 5. The hook 7 and hooks 13 are formed in accordance with the invention disclosed in this application and shown in detail in Figs. 3 to 6 inclusive. Hook 7 and hooks 13 are identical and, for the purposes of this application, in Figs. 3 to 6 inclusive will be given the numeral 14.v The hook end of each shaft is preferably round with the portion'15 thereof cutaway beyond the longitudinal axis of the'shaft, as clearly shown in Figs. 3 and 4. The'tip'16 is left intact and preferably rounded as f gitudinal groove 23 is cut in the side of the finger 21. The inner upper portions of the fingers are preferably rounded as shown at 24 in Fig. 4. Other parts of the hook are.

preferably rounded in order that there are no sharp edges to cut the string or loop.

In operation the loopmay be thrownover the fingers as shown in Fig. 3, the sides of the loop fitting in the grooves 22 and 23. It

-will be noted that the grooves 22 and 23 are diametrically opposite and that the centers of curvature of same are on a line which intersects the longitudinal axis of the shaft- The string 8 is thus rotated about its longitudinal axis. It is understood that there isa duplicate machine such as is shown in Figs. 1 and 2 at the opposite end of the string 8to secure said end of the string. String 8 of course is held taut between the two machines. The machines are preferably operated by synchronous motors such that each pair of oppositely disposed hooks rotate at the same speed and in synchronism.

Should the string 8 be slightly off center due perhaps to an inequality in the knot 25 between the loop 9' and the string 8, the string may be secured by means shown in Fig. 4 wherein the knot 25 itself is held by the fingers 20 and 21, the string8 passing down into the aperture 18 through theslot 19. The countersunk portion 18 allowsthe end of the string at the knot freedom of movement and thereby compensates for any slight deviation from alignment of the oppositely disposed machines 1 holding opposite ends'of the string 8. The string 8 may be secured to the hook in a still difierent manner-such as disclosed in Fig. 2, wherein the loopr9'is passed over the hook and the sides of the loop passed downward through the slot 19, securing the loop in the-position clearly shown in Fig. 2. It is thus seen that correct alignment of the string may be easilyland quickly effected and to the exact form, construction, arrangement and combination of parts herein shown and described, or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

1. In a hook for polishing machines of the kinddescribed, a shaft having a-fixed axis of rotation, said shaft having a recess extending to'beyond the center line and near one end, said endportion having an axially disposed longitudinally extending countersunk aperture, a radially disposed slot in said end portion opening-into said aperture and extending to the lateral face of the hook, and oppositely disposed longitudinally extending grooves in the'outer surface of said end portion.

' 2. In a-device of the class described, the combination of a shaft having a fixed axis of rotation, and a hook adjacent one end there'- of and rigid with respect thereto, said hook comprisinga pair of fingers having overhanging portions formed therein and oppositely disposed longitudinally extending grooves f'orme'd'in the outer faces thereof in a plane common to each other and to the axis of rotation of said shaft;

3. In a hook for polishing machines of the kind described, a shaft having a fixedaxis of rotation, said shaft having a recess extending to beyond the center line thereof and forming a portion of reduced dimensions at one side of the shaft adjacent one of its end portions, said endportion having an axially positioned longitudinally disposed aperture formed therein extending into said recess and having a radially disposed slot opening into saidaperture and extending to the lateral face of said end portion at the opposite side of the aperture from the portion of reduced dimensions formed on said shaft.

In testimony whereof, 'I have hereunto signedmy name.

KGU'Y L. MATTHEWS.

that the string may be readily attached and detached from the hook. The slight'devi'ation from alignment in any one of the positions is sosmall' as tobe of. small consequence when compared to an ordinary hook used for this purpose. It is of course understood that the machine partially shown is capable of handling several strings atone time. It is thus seen that a highly novel device has been produced satisfactory for its intended purposes. I

Having thus described my invention, it is obvious that various immaterialimodifications may be made in the same without departing from. the spirit of my invention; hence I do notwish to beunderstoodas limiting myself 

